compiler/testData/codegen/box/functions/defaultargs6.kt - third_party/github/JetBrains/kotlin - Git at Google

 interface A {
     fun foo(x: Int, y: Int = x + 20, z: Int = y * 2) = z
 }

 class B : A {}

 fun box() = if (B().foo(1) == 42) "OK" else "Fail"
	interface A {
	fun foo(x: Int, y: Int = x + 20, z: Int = y * 2) = z
	}

	class B : A {}

	fun box() = if (B().foo(1) == 42) "OK" else "Fail"